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An X-ray inspection device achieves a high cooling effect without using
an expensive air conditioner and is excellent in cleaning property. The
inside of a first case of an X-ray inspection device is separated into
plural cooling partitions by separation walls by the use limit
temperature and the like, and heat sources respectively having intrinsic
use limit temperature are stored in respective partitions. Because a flow
passage of air is set inside the cooling partition so that the heat
sources having low use limit temperature are disposed upstream of the
heat sources having high use limit temperature, the cooling efficiency is
excellent. A heat absorption member of a heat exchange device exists
inside the first case, and a heat radiation member exists inside a second
case communicating with the external air. Because there is no protrusion
of the heat radiation member as the total cases, cleaning property is
excellent.

1. An X-ray inspection device that inspects an object to be inspected by
detecting X-rays irradiated to and transmitted through the object to be
inspected, comprising: a first case that stores a plurality of heat
sources inside and is closed against an environmental atmosphere; a
second case that is attached to the first case and is opened to the
environmental atmosphere; and a heat exchange device for cooling the heat
sources, the heat exchange device including a hermetically closed case
and a heat exchange medium, the case having a heat absorption member
disposed inside the first case and a heat radiation member disposed
inside the second case, the heat exchange medium being sealed inside the
case and conducting heat from the heat absorption member to the heat
radiation member without being imparted with work from the outside.

2. The X-ray inspection device according to claim 1, wherein a flow
passage for cooling the heat sources by making air circulate in a
predetermined order is formed inside the first case.

3. The X-ray inspection device according to claim 2, wherein a plurality
of cooling partitions which are separated based on use limit temperature
of the heat sources and in which the heat sources of the use limit
temperature are stored are arranged inside the first case, and the flow
passage is set inside the cooling partitions so that the heat sources the
use limit temperature of which is low are disposed upstream of the heat
sources the use limit temperature of which is high.

4. The X-ray inspection device according to claim 1, wherein inside the
first case, an X-ray generating device is disposed at the center part of
the first case, an LCD and a control unit as the heat source are disposed
on the front face side of the first case, electric supply units as the
heat source are disposed on the side face side of the first case, and the
heat absorption member of the heat exchange device is disposed on the
back face side of the first case, inside the second case, the heat
radiation member of the heat exchange device is disposed on the back
surface side of the second case, and the heat radiation member opposes an
exhaust port formed on the back surface side of the second case.

5. The X-ray inspection device according to claim 4, wherein an
interference prevention plate in which air introduced to the heat
absorption member along the flow passage after cooling the control unit
collides on one surface and air introduced to the heat absorption member
along the flow passage after cooling the electric supply unit collides on
another surface is arranged inside the first case.

Description

TECHNICAL FIELD

[0001] The present invention relates to an X-ray inspection device that
irradiates X-rays to an object to be inspected, detects the X-rays having
transmitted the same and thereby inspects the same, and relates
specifically to an X-ray inspection device that can cool heat sources
inside cases by a heat exchange device and is excellent also in cleaning
property of the outer surface of the case.

BACKGROUND ART

[0002] In Japanese Patent No. 5364302, as a prior art of an invention
related to the patent application, an X-ray foreign object detection
device including an industrial use air conditioner is described in the
paragraph of the background art. As shown in FIG. 14 of the literature,
an air conditioner 102 is protrudingly attached to the outer surface on
the back face side of a case 101 of the X-ray foreign object detection
device 100. With respect to a casing 104 that forms the outer shape of
this air conditioner 102, its inside is separated by a separation wall
103, one side communicates with the case 101 of the X-ray foreign object
detection device 100, and the other side communicates with the external
air. Also, it is configured that a radiator 105 is arranged in the
separation wall 103 inside the casing 104. Further, the inside of the
casing 104 and the inside of the case 101 that communicates therewith are
cooled by the arrangement that the heat inside is exchanged with the
external air and is transferred and discharged by the radiator 105.

SUMMARY OF INVENTION

Technical Problem

[0003] An X-ray inspection device for industrial use has been widely used
which irradiates X-rays to an object to be inspected, detects the X-rays
having transmitted the same, and thereby inspects the same. With respect
to the X-ray inspection device, an electric supply and the like which is
a heat source is stored inside a case which is a main body and the X-ray
inspection device generates due amount of heat at the time of use, and
therefore one with an air-cooled structure is known in which a filter is
arranged at an opening formed in the case with the aim of cooling the
inside of the case, and the external air is taken in to the inside of the
case by air blow means such as a fan.

[0004] However, in such X-ray inspection device for industrial use, in the
case the food and the like for example is made the object to be
inspected, the dust and the moisture such as the water drops generated
from the food and the like are present much in the environment of the
inspection line where the device is installed, therefore the air
including them passes through the filter arranged in the opening of the
case, and thereby there is a case the internal board such as the control
board and the power supply board is corroded or short-circuited which
results in detriment of the function of the X-ray inspection device.

[0005] In order to eliminate such defect of the air-cooled structure
caused by suction of the external air and to obtain a secure cooling
effect, there is a case of using an X-ray foreign object inspection
device externally attaching an industrial air conditioner on the outer
surface of the case as explained previously referring to Japanese Patent
No. 5364302. However, because such air conditioner is not merely a heat
exchange device but a device including a compressor and driven by
electric power, there is a problem that the cost of itself is high, the
cost of the total X-ray foreign object inspection device therefore
becomes high, and the running cost increases. Also, because of the
structure of being externally attached to the outer surface of the case
of the X-ray foreign object inspection device, the outline dimension of
the total X-ray foreign object inspection device becomes large, and such
case is possible that the complicated outer shape becomes a disturbance
of cleaning in cleaning frequently required when a food and the like is
made an object to be inspected and a problem occurs in the sanitary
property.

[0006] The present invention has been achieved in view of the problems in
the prior art described above, and aims to provide an X-ray inspection
device including cooling means achieving high cooling effect and having
sufficient cleaning property without using an air conditioner whose
equipment cost and running cost are high.

Solution to Problem

[0007] The X-ray inspection device according to a first aspect of the
invention is an X-ray inspection device that inspects an object to be
inspected by detecting X-rays irradiated to and transmitted through the
object to be inspected, comprising a first case that stores a plurality
of heat sources inside and is closed against an environmental atmosphere,
a second case that is attached to the first case and is opened to the
environmental atmosphere, and a heat exchange device for cooling the heat
sources, the heat exchange device including a hermetically closed case
and a heat exchange medium, the case having a heat absorption member
disposed inside the first case and a heat radiation member disposed
inside the second case, the heat exchange medium being sealed inside the
case and conducting heat from the heat absorption member to the heat
radiation member without being imparted with work from the outside.

[0008] The X-ray inspection device according to a second aspect of the
invention is the X-ray inspection device according to the first aspect in
which a flow passage for cooling the heat sources by making air circulate
in a predetermined order is formed inside the first case.

[0009] The X-ray inspection device according to a third aspect of the
invention is the X-ray inspection device according to the second aspect
in which plural cooling partitions which are separated based on use limit
temperature of the heat sources and in which the heat sources of the use
limit temperature are stored are arranged inside the first case, and the
flow passage is set inside the cooling partitions so that the heat
sources the use limit temperature of which is low are disposed upstream
of the heat sources the use limit temperature of which is high.

[0010] The X-ray inspection device according to a fourth aspect of the
invention is the X-ray inspection device according to any one of the
first to third aspects in which, inside the first case, an X-ray
generating device is disposed at the center part of the first case, an
LCD and a control unit as the heat source are disposed on the front face
side of the first case, electric supply units as the heat source are
disposed on the side face side of the first case, and the heat absorption
member of the heat exchange device is disposed on the back face side of
the first case, inside the second case, the heat radiation member of the
heat exchange device is disposed on the back face side of the second
case, and the heat radiation member opposes an exhaust port formed on the
back face side of the second case.

[0011] The X-ray inspection device according to a fifth aspect of the
invention is the X-ray inspection device according to the fourth aspect
in which an interference prevention plate in which air introduced to the
heat absorption member along the flow passage after cooling the control
unit collides on one surface and air introduced to the heat absorption
member along the flow passage after cooling the electric supply unit
collides on the other surface is arranged inside the first case.

Advantageous Effects of Invention

[0012] According to the X-ray inspection device described in the first
aspect, as cooling means inside the case, not an air conditioner
requiring energy but a heat exchange device having a simple structure is
used. Therefore, the cost is low, and the running cost is also low.
Further, at the time of using the X-ray inspection device, the heat
generated from the heat sources inside the first case is absorbed by the
heat absorption member of the heat exchange device inside the first case,
is radiated from the heat radiation member of the heat exchange device
arranged inside the second case, and is discharged to the environmental
atmosphere through the air inside the second case. Thus, the heat
exchange device in the present invention is arranged so as to penetrate
the wall body of the first case which stores the heat sources, and has
therefore a structure protruding from the outer surface of the first
case. However, because the heat radiation member of the heat exchange
device protruding from the outer surface of the first case is arranged
integrally with the first case and is stored in the second case that is
opened to the environmental atmosphere, particular unevenness is not
generated in the outer shape as the total of the first and second cases.
Therefore, the cases of the X-ray inspection device are easy in cleaning
and are excellent in the sanitary property.

[0013] According to the X-ray inspection device described in the second
aspect, because the flow passage that makes the air circulate in a
predetermined order is formed inside the first case, the air for cooling
can be securely supplied to the heat sources inside the first case. Also,
even when the heat source exists in plural numbers, the air flowing along
the flow passage reaches respective heat sources successively, and
respective heat sources can be cooled securely.

[0014] According to the X-ray inspection device described in the third
aspect, with respect to the plural heat sources existing inside the first
case, as an index showing the heat resistant performance or the upper
limit of the usable environmental temperature, intrinsic use limit
temperature is determined respectively. Also, the inside of the first
case is separated into plural cooling partitions having different use
limit temperature, and, in each cooling partition, the heat source having
the use limit temperature corresponding to the cooling partition is
stored. Further, the flow passage of the air is set so that the heat
source having low use limit temperature is disposed upstream of the heat
source having high use limit temperature in order that the air flows to
the heat source having high use limit temperature and cools the same
after cooling the heat source having low use limit temperature, or in
order that the air which has cooled the heat source having high use limit
temperature and of which temperature has risen does not flow through the
heat source having low use limit temperature. Therefore, because the air
flowing through the flow passage passes and circulates from the heat
source having low use limit temperature toward the heat source having
high use limit temperature while cooling the heat sources having
predetermined use limit temperature for respective cooling partitions or
passes and circulates through the heat source having low use limit
temperature before the heat source having high use limit temperature,
each heat source can be securely cooled in each cooling partition.

[0015] According to the X-ray inspection device described in the fourth
aspect, the heat generated respectively by the control unit and the
electric supply unit disposed at respective positions inside the first
case can be absorbed by the heat absorption member of the heat exchange
device disposed on the back face side inside the first case, can be
radiated from the heat radiation member of the heat exchange device
disposed on the back face side inside the second case, and can be
discharged outside through the exhaust port arranged on the back face
side inside the second case.

[0016] According to the X-ray inspection device described in the fifth
aspect, inside the first case, the air having cooled the control unit is
introduced to the heat absorption member along the flow passage, and
collides on one surface of the interference prevention plate to change
the direction. Also, the air having cooled the electric supply unit is
introduced to the heat absorption member along the flow passage, and
collides on the other surface of the interference prevention plate to
change the direction. Thus, because these two air flows collide on the
front face and the back face of the interference prevention plate
respectively, there is no possibility of colliding on each other in the
partition where the heat absorption member is disposed. Therefore, it is
possible to lead these two air flows smoothly to the heat absorption
member of the heat exchange device without making them interfere with
each other, and to effect efficient heat absorption.

BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a transverse cross-sectional view in the first case of
the X-ray inspection device of the present embodiment;

[0018] FIG. 2 is a transverse cross-sectional view in the second case of
the X-ray inspection device of the present embodiment; and

[0019] FIG. 3 is a vertical cross-sectional view of the X-ray inspection
device of the present embodiment.

DESCRIPTION OF EMBODIMENTS

[0020] The first embodiment of the present invention will be described
referring to FIG. 1-FIG. 3.

[0021] An X-ray inspection device 1 of the present embodiment shown in
FIG. 1 to FIG. 3 is a device that irradiates X-rays from an X-ray
generation device to an object to be inspected transported by
transportation means, detects the X-rays having transmitted through the
object to be inspected by a sensor, and thereby inspects the object to be
inspected. Further, in FIG. 1 and FIG. 2, although an X-ray generation
device 2 generating X-rays is shown as a tank 2a and a tank cooling unit
2b, the object to be inspected, transportation means for transporting the
object to be inspected, and a sensor for detecting the X-rays having
transmitted through the object to be inspected are not illustrated.

[0022] As the body frame of the device, the X-ray inspection device 1 of
the present embodiment includes a first case 3 and a second case 4
integrally attached onto the first case 3 as shown in FIG. 1 to FIG. 3.
Although the first case 3 is closed against the environmental atmosphere
(outer field) to the degree the air dos not circulate directly between
the environmental atmosphere, it is configured to be capable of
approaching the internal structure for cleaning, maintenance, repair, and
the like by opening a lid and the like which is not illustrated. Further,
although the second case 4 does not communicate with the first case 3 and
the air does not circulate between the first case 3, the second case 4 is
opened to the environmental atmosphere through an intake port 5 and an
exhaust port 6 arranged in the back face.

[0023] The tank 2a of the X-ray generation device 2 described above is
disposed generally in the center part inside the first case 3 as shown in
FIG. 1, and the tank cooling unit 2b of the X-ray generation device 2 is
disposed on the front face side of the second case 4 as shown in FIG. 2.
In other words, the X-ray generation device 2 is disposed inside both
cases 3, 4 so as to penetrate a boundary wall 7 of both cases 3, 4 which
is the top plate of the first case 3 or the bottom plate of the second
case 4. The tank 2a of this X-ray generation device 2 is configured to
store an X-ray source inside a container filled with oil for cooling.
Also, the tank cooling unit 2b arranged on the upper surface of the tank
2a is formed of fins for heat radiation covered with a cover.

[0024] As shown in FIG. 2, the intake port 5 and the exhaust port 6 are
arranged on the back face side of the second case 4. Also, the inside of
the second case 4 is separated into two chambers of an intake chamber 8
including the intake port 5 and an exhaust chamber 9 including the
exhaust port 6 by a wall body 10, and the tank cooling unit 2b described
above is disposed so as to penetrate the wall body 10 and forms a part of
a flow passage A (shown by an arrow in the drawing) of the air that flows
from the intake chamber 8 to the exhaust chamber 9. Further, as described
below, a radiation member 15b of a heat exchange device 15 and a fan F
are disposed near the intake port 5 of the intake chamber 8 inside the
second case 4, and a fan F is disposed near the exhaust port 6 of the
exhaust chamber 9 inside the second case 4.

[0025] As shown in FIG. 1, the inside of the first case 3 is separated
into plural chambers called cooling partitions C1 to C4 by the tank 2a of
the X-ray generation device 2 disposed at the center part thereof and
plural separation walls 16 properly disposed around the tank 2a, and
respective devices which are the heat sources to be cooled or the heat
exchange device 15 which is cooling means are stored within these
respective cooling partitions C1 to C4. With respect to the plural heat
sources existing inside the first case 3, as the index indicating the
heat resistant property or the upper limit of the usable environmental
temperature, the intrinsic use limit temperature is determined
respectively. Also, as described below, the plural cooling partitions C2
to C4 where the heat sources are stored are separated for each use limit
temperature of the heat source stored there. In other words, for each of
the cooling partitions C2 to C4, the use limit temperature of the heat
source stored there is determined.

[0026] First, as shown in FIG. 1 and FIG. 3, on the back face side of the
inside of the first case 3, the first cooling partition C1 is arranged.
This first cooling partition C1 is a heat absorption area, the heat
source is not disposed here but a heat absorption member 15a of the heat
exchange device 15 is disposed. This heat exchange device 15 is a device
in which a heat conducting medium is sealed inside a hermetically sealed
case, and the lower half thereof shown in FIG. 3 is the heat absorption
member 15a provided with the heat absorption fins. As shown in FIG. 1,
the fan F is provided in this heat absorption member 15a, and it is
configured to suck the air present in the first cooling partition C1 to
the heat absorption member 15a to allow passing through and to promote
heat absorption by the fins.

[0027] Also, the upper half part of the heat exchange device 15 shown in
FIG. 3 is the heat radiation member 15b provided with the heat radiation
fins. As described above referring to FIG. 2, this heat radiation member
15b is disposed near the intake port 5 inside the intake chamber 8 of the
second case 4 which is the heat radiation area. The fan F is arranged in
the heat radiation member 15b, and it is configured to suck the external
air to cool the heat radiation member 15b, and to supply the air to the
tank cooling unit 2b described above to cool the X-ray generation device
2.

[0028] As shown in FIG. 1, at generally center part of the inside of the
first case 3, the second cooling partition C2 is arranged. This second
cooling partition C2 is a chamber having generally annular shape in a
plan view configured by separating a part of the surrounding of the tank
2a disposed at generally center part by the separation wall 16. In
relation with the direction of the flow passage of the air generated in
the second cooling partition C2 by the fan F of the heat exchange device
15 (the flow of the air shown by an arrow B in the drawing), a PC 17 as a
control unit is disposed on the front face side of the first case 3 which
is on relatively upstream side, and a first electric supply unit 18 is
disposed on the right side face side (the left side in FIG. 1) of the
first case 3 which is on relatively downstream side. The PC 17 is a
device for controlling respective parts of the X-ray inspection device 1,
the first electric supply unit 18 is a device for supplying required
electric supply to portions other than the X-ray generation device 2, and
both are the heat sources requiring cooling. Also, the use limit
temperature of the both is equally 60.degree. C. The fan F is arranged
for each of the PC 17 and the first electric supply unit 18, and it is
configured to effect cooling by sucked air. Further, in the separation
wall 16 that separates a first electric supply unit 18 and the first
cooling partition C1 from each other, with the first electric supply unit
18 being positioned on the furthest downstream side with respect to the
direction of a flow passage B of the air in the second cooling partition
C2 and with the heat exchange device 15 existing in the first cooling
partition C1, the fan F is penetratingly arranged, and it is configured
that the air having cooled the first electric supply unit 18 and having
been heated is returned to the first cooling partition C1.

[0029] As shown in FIG. 1, on relatively upstream side of the PC 17 with
respect to the direction of the flow passage B of the air generated
inside the second cooling partition C2 by the fan F of the heat exchange
device 15, the third cooling partition C3 communicating by an opening
formed in the separation wall 16 is arranged with predetermined
independency from the second cooling partition C2. This third cooling
partition C3 exists on the opposite side face of the device 1 with
respect to the first electric supply unit 18 of the second cooling
partition C2 and is disposed on left side face side (the right side in
FIG. 1) of the first case 3, and a second electric supply unit 19 is
arranged inside thereof. This second electric supply unit 19 is a device
for supplying an electric supply required for driving the X-ray
generation device 2, and is a heat source requiring cooling. Also, its
use limit temperature is 50.degree. C., and is lower than 60.degree. C.
which is the use limit temperature of the heat source of the second
cooling partition C2. The second electric supply unit 19 is provided with
a fan F, and is configured to be cooled by the sucked air. Further, the
fan F is penetratingly arranged in the separation wall 16 that separates
the third cooling partition C3 and the first cooling partition C1 where
the heat exchange device 15 exists, and it is configured that the air
having cooled the second electric supply unit 19 and having been heated
is returned to the first cooling partition C1.

[0030] As shown in FIG. 1, at the position on relatively downstream side
of the third cooling partition C3 with respect to the flow passage B of
the air generated inside the second cooling partition C2 by the fan F of
the heat exchange device 15 and is generally same position with the PC
17, the fourth cooling partition C4 separated against the second cooling
partition C2 by the separation wall 16 is arranged with predetermined
independency from the second cooling partition C2. This fourth cooling
partition C4 is disposed on a further front face side of the first case 3
than the PC 17, and an LCD (liquid crystal display device) 20 is disposed
inside thereof to allow visibility from the outside of the first case 3.
The LCD 20 is obtained by adhering a touch panel, is a device used as a
display device for displaying information and the like required at the
time of operation of the X-ray generation device 2 or an input device in
executing various operations, and is a heat source requiring cooling.
Also, its use limit temperature is 50.degree. C., and is lower than the
use limit temperature 60.degree. C. of the PC 17 and the first electric
supply unit 18 which are the heat sources of the second cooling partition
C2.

[0031] As shown in FIG. 1, although there is no fan F for exclusive use in
the LCD 20 particularly, the air having flown through the second cooling
partition C2 is divided into two routes before the PC 17, and one of them
circulates through the LCD 20 of the fourth cooling partition C4, cools
it, thereafter enters the first electric supply unit 18 of the second
cooling partition C2 again, and returns to the first cooling partition
C1. Also, the flow of the air flowing through the second cooling
partition C2 and being headed for the PC 17 cools the PC 17, and
thereafter returns to the first cooling partition C1 through a duct 21.
In other words, the second cooling partition C2 in the vicinity of the PC
17 and the first cooling partition C1 are connected with each other by
the duct 21, the fan F for drawing the air into the first cooling
partition C1 is arranged at an opening of the duct 21 connected to the
first cooling partition C1, and it is configured to return the air having
cooled the PC 17 into the first cooling partition C1.

[0032] As shown in FIG. 1 and FIG. 3, inside the first cooling partition
C1 inside the first case 3, an interference prevention plate 22 of the
flow-in air is disposed in the vicinity of the heat absorption member 15a
of the heat exchange device 15. Because of the disposal angle of the
interference prevention plate 22, the air supplied by the fan F through
the duct 21 hits one surface of this interference prevention plate 22 to
change the direction, and is led to the heat absorption member 15a. Also,
the air supplied by the fan F from the first electric supply unit 18 of
the second cooling partition C2 hits the other surface of this
interference prevention plate 22 to change the direction, and is led to
the heat absorption member 15a. Thus, because the flows F, F of the air
coming from these two fans F, F respectively hit the front face and the
back face of the interference prevention plate 22, there is no
possibility that these two flows collide on each other in the first
cooling partition C1 where the heat absorption member 15a of the heat
exchange device 15 is disposed. Therefore, two air flows B, B do not
interfere with each other, are led smoothly to the heat absorption member
15a of the heat exchange device 15, and are heat-absorbed efficiently.

[0033] As shown in FIG. 3, in the lower part inside the first cooling
partition C1 of the first case 3, an I/F unit 23 for external apparatuses
is disposed. Also, below the first cooling partition C1 of the first case
3, a chamber D isolated from the first cooling partition C1 is arranged,
and a fan F for cooling a heat source is arranged which is not
illustrated.

[0034] As means for cooling the heat sources inside the first case 3, the
X-lay inspection device 1 described above uses not an air conditioner
requiring energy but the heat exchange device 15 having simple structure.
Therefore, there is a feature that the cost is inexpensive and the
running cost is also low. Here, it is considered in general that,
compared to an air conditioner requiring energy, mere heat exchange
device 15 is inferior in the cooling capacity, however, according to the
X-ray inspection device 1 of the embodiment secures sufficient cooling
capacity, no trouble occurs practically. The reason is that the inside of
the first case 3 is separated into plural cooling partitions C1 to C4
having different use limit temperature, among them, the cooling
partitions C2 to C4 store the heat sources having the use limit
temperature corresponding to the cooling partition, the flow passage B
making the air circulate through respective cooling partitions C1 to C4
in a predetermined order is arranged, and it is configured that each heat
source having different use limit temperature can be efficiently cooled.

[0035] In other words, between the third cooling partition C3 where the
second electric supply unit 19 having low use limit temperature exists
and the first cooling partition C1 where the heat absorption member 15a
exists, it is configured that the air directly circulates, whereas with
respect to the fourth cooling partition C4 where the LCD 20 having low
use limit temperature exists, it is configured that the air from the
first cooling partition C1 where the heat absorption member 15a exists is
made to directly flow in before cooling other heat sources, the air after
cooling is made to flow through the second cooling partition C2 where the
first electric supply unit 18 having higher use limit temperature exists,
and is used for cooling. Also, with respect to the PC 17 that is
positioned inner than the LCD 20 and is disposed so as to be hardly
cooled, consideration is given so that a large portion of the air
immediately after cooling the PC 17 is sucked to the first cooling
partition C1 directly by the duct 21 and the fan F and that cooling by
the PC 17 can be effected more efficiently.

[0036] Thus, inside the first case 3, a flow passage is formed which is
for making the air circulate through the inside of the first case 3 as
described below.

[0037] 1) The air is made to circulate between the cooling partition C3
whose use limit temperature is low and the cooling partition C1 where the
heat exchange device 15 exists, and the second electric supply unit 19 is
cooled.

[0038] 2) The air is made to circulate consecutively through the PC 17 and
the first electric supply unit 18 existing inside the same cooling
partition C2 and having equal use limit temperature to effect cooling,
and is made to recirculate thereafter to the first cooling partition C1
where the heat exchange device 15 exists.

[0039] 3) The air from the first cooling partition C1 where the heat
exchange device 15 exists is made to circulate through the cooling
partition C4 where the LCD 20 having low use limit temperature exists
before the heat sources having high use limit temperature, is made to
flow thereafter through the cooling partition C2 where the first electric
supply unit 18 having high use limit temperature exists, and effects
cooling consecutively.

[0040] Therefore, at the time of using the X-ray inspection device 1,
plural heat sources inside the first case 3 are cooled efficiently by the
air flowing along the flow passage B which is set between the cooling
partitions based on the use limit temperature, and the heat thereof is
efficiently absorbed by the heat absorption member 15a of the heat
exchange device 15, is radiated from the heat radiation member 15b of the
heat exchange device 15 disposed on the back face side of the inside of
the second case 4, is added also with the heat from the tank cooling unit
2b, and is discharged along with the exhaust air to the environmental
atmosphere from the exhaust port 16 for heat radiation arranged on the
back face side of the second case 4.

[0041] Also, the heat exchange device 15 is arranged so as to penetrate
the boundary of the first case 3 and the second case 4, and has a
structure that the heat radiation member 15b protrudes from the outer
surface of the first case 3. However, because the heat radiation member
15b of the heat exchange device 15 protruded from the outer surface of
the first case 3 is arranged integrally with the first case 3 and is
stored in the second case 4 which is opened to the environmental
atmosphere, particular unevenness is not generated in the outer shape as
the total of the first and second cases 3, 4. Therefore, the cases 3, 4
of the X-ray inspection device 1 are easy to clean and are excellent in
the sanitary property.

[0042] An air conditioner includes a compressor driven by electric power,
and utilizes a refrigerant that absorbs heat from the low temperature
section and radiates the heat to the high temperature section by
imparting work from the outside. According to the present invention, the
heat exchange medium described above is different from the refrigerant,
receives heat at the section having relatively high temperature, and
conducts the heat to the section having relatively low temperature for
radiation.